2manyhorses
Posted : 11/25/2010 3:53:45 PM
The pawing is simply a yum! response. Alot of horses do it. It's not the source of her lameness. Horses will paw with the bad leg because they need to stand on the good one. Her age, weight, prior use, comformation and 
roir injuries all play a role in her front end lameness. If you took xrays of her front feet, you will most likely find some degeneration of the coffin bone or other structure.
Moderate exercise is still best for her. Being able to meander is the best thing to keep her loose. While joint supplements are safe, I'd first have a conversation with your farrier of ways to make her most comfortable. Adding front shoes is she's barefoot can go a long way to making her pain free. The one product not safe for pregnant mares is Devil's Claw.